Electric-circuit-breaking switch



J. S. THOMPSON.

ELECTRIC CIRCUIT BREAKING SWITCH.

APPLICATION FILED SEPT 29. I920.

Patented June 7, 1921,

m I M IN V EN TOR ATTORNEYS.

PATENT OFFICE.

JOSEPH S. THOMPSON, OF MILL VALLEY, CALIFORNIA.

ELECTRIC-CIRCUIT-BREAKIIN'G SWITCH.

Specificationof Letters Patent.

Patented June it, 1921.

Application filed September 29, 1920. Serial No. 413,557.

T all 720m it may concern:

Be it known that I, JosnrH S. THOMPSON, a citizen of the United States,and a resident of Mill Valley, in the county of Marin and State ofCalifornia, have invented a new and useful Improvement inElectric-Circuit- Breaking Switches, of which the following pin (3) is aspecification. 7

My invention relates to switches for handling high voltage electriccurrent and my object is first, to secure a simple automatic overloadrelease circuit breaking switch for outdoor installation, and second, toarrange the tripping mechanism of this switch so that it is supportedsolely on'the line insulators necessary to support the contact and bladeportions-of the switch.

I attain these. ob 'ects by' the device illustrated in the accompanyingdrawing in which Figure I is a side elevation of a single pole switchcomplete, Fig. II is a view of the switch in the open position, and Fig.III is a partly sectional view of the tripping coil,

latch, plunger and contact.

Similar. letters refer to similar parts throughout the several views.

In my design 1 is a metal base, 2is aiixed projecting pin, 3 is a pin somounted on the base (1). as to permit a rocking motion to be imparted toit by the shaft 4,Ithe pro jecting pin of the base (1) and rockingsupporting the insulator 5 and 5'. On the insulator (5) is supported bysuitable means a projecting member or plunger face, 6, which may be ofinsulating material, and a contact member 7. If convenience required.the contact and other portions supported on insulator (5) could be madeup in one piece. Supported on insulator (5) is a plunger chamber 8, inwhich is carried the plunger 9, and the plunger spring 10, supportingacontact 11,- a coil housing-12, and the coil 18, mounted in suchposition over the plunger (9) that by means of a latch 14, it canrelease the plunger permitting the spring (10) to force the plunger outandpushing the rocker unit supported on pin (3) outward, gravitycompleting the travel of the unit to the point where a suitablestop '15,checks its movement, thus opening the switch. It will be seen that byextending I the shaft (4) and mounting other units on it, a multipolarswitch can be made, and that the releasing of any one of the trippinglatches will accomplish the opening of all the poles of the switch. Asuitable handle 16, mounted on the shaft (at) can be operated to closethe switch, the projecting member (6) pressing back the plunger it isengaged by the latch (14). It will also be seen that thetrippingmechanism of this switch is mounted on the line in sulatoi'sused to support the blade and contact, which insulators can be similarto those used throughout'the rest-of the line, and that it does notrequire insulated rods or extra insulators for conveying the trippingmovement, a

What I claim is:

1. In an electric switch, a plunger engag- 9) until ing face and aswitch blade on a rocker insulator, and acontact-.clip,a spring actuatedplunger, a releasing latch and actuating series coil on a fixedinsulator, the rocker insulator plunger face capable of being open atedto force back the plunger into a latched position and the plungercapable of forcing away the rocker insulator plunger face, and with'itthe switch blade upon the release, through a predetermined flow or.current through the series coil, of the plunger releasing latch.

a 2. In an electric switch, a plunger-engag v mg face of insulatingmaterial, and a switch blade on a rocker insulator and a contact clip, aspring actuated plunger, a releasing latch and actuating series coil ona fixed insulator, the rocker insulator plunger face capable of beingoperated to force back the plunger into a latched position and theplunger capable of'forcin'g away the rocker insulator plunger face, andwith it the switch blade upon the release,.through a predetermined flowof current through the series coil, of the plunger releasing latch.

In witness whereof, I havehereunto set my hand this Q Othday ofSeptember, 1920.

' JOSEPH S. THOMPSON.

Witnesses: I v VIOLA M. HA S N," ZJA'S. AaTl-ioMPsN.

